Won't Update Can't Find Updates Manually Or Automatically

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http://forum.xda-developers.com – Hello community i have a big dilema, i have an asus tf300t that is behind on updates. When i click on check update it says there is no updates available for your device currently. So when i go to the asus site there are updates for my tablet. i have already done a factory reset and it didnt make a diference. cCan someone please help me out on this? (HowTos)